20402420043634 has 32 divisors (see below), whose sum is σ = 31380813749376. Its totient is φ = 9944664787200.

The previous prime is 20402420043631. The next prime is 20402420043637. The reversal of 20402420043634 is 43634002420402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20402420043631) and next prime (20402420043637).

It is a self number, because there is not a number n which added to its sum of digits gives 20402420043634.

It is not an unprimeable number, because it can be changed into a prime (20402420043631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42547309 + ... + 43024159.

It is an arithmetic number, because the mean of its divisors is an integer number (980650429668).

Almost surely, 2^{20402420043634} is an apocalyptic number.

20402420043634 is a deficient number, since it is larger than the sum of its proper divisors (10978393705742).

20402420043634 is a wasteful number, since it uses less digits than its factorization.

20402420043634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479490.

The product of its (nonzero) digits is 110592, while the sum is 34.

The spelling of 20402420043634 in words is "twenty trillion, four hundred two billion, four hundred twenty million, forty-three thousand, six hundred thirty-four".